Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ba3fc0d2b1a3ce…

MALICIOUS

PDF

76.1 KB Created: 2021-09-01 12:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b6cd4a33581528c2f1b65744ec1ee8a2 SHA-1: f11374fc7b11d5589a947ed03b6d047b945652d1 SHA-256: 18ba3fc0d2b1a3ce979c2e36561a3bf2a7bc03589fec8880fa2f873442952e34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=apocalypto+full+movie+with+english+subtitles+watch+online+free+hd PDF link annotation
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/pc5t41jad1m8uepgpqsqu931r1/pipumunavizajefapo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e581d1ab46---nimijawibipojuwuves.pdfIn PDF document text
    • http://knauto.com/upload/file///16498589949.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/40871510685.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/xivesiluzuxokanidadiwop.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/eioajtllpetms04cklg99dem3g/tofunumum.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c9682a74415b629ee3891d63bdfee616/19398391061.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/27466814796.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/464c63e11ec1dc0d3e74666456c9981e/pezibadekokilofirisuloz.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/62665940765.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/tajeximuje.pdfIn PDF document text
    • http://insei.eu/userfiles/files/74132757971.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70625953f---kikizevusepuveg.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/41115ffce40a7ac205a472f9afbac1bc/38708390284.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/jugexuboviluzosaledibuz.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/wasigavasila.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/07efanglhej3slhisnho3pjfg4/3227541723.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210814031704.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160f4236c6828e---fevusudupanotezaxuvotid.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/66722276191.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/gadowulezol.pdfIn PDF document text
    • http://perfecturology.cafe24.com/upload/editor/imagefile/70757985706.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC110 17764 bytes
SHA-256: a66f67d956e0e194e4ed8f8fb6838e8a0a550b48c7ab3e1e93e926c0f7620745
font_01_sfnt_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 11556 bytes
SHA-256: d19e2167776cb18fe0cefdebecc28f05885b4d1f604ff31e3913c135e12a8cfc

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